Decision Tree for Common Computer Ports Expert System
U - Universe of Discourse
LA - Mode of Connection
 |V - pins in rows
 -LA - number of pins
 - LV - 25
 - -|C - DB25 Male
 - LV - 9
 -  |C - DB9 Male
 |V - sockets in rows
 -LA - number of pins
 - LV - 25
 - -|C - DB25 Female
 - LV - 15
 -  LA - number of rows
 -   LV - 2
 -   -|C - Db15 Female
 -   LV - 3
 -    |C - Hd15 Female
 |V - sockets in a circular fashion
 -LA - circle shape
 - LV - a full circle
 - -LA - number of sockets
 - - LV - 4
 - - -|C - S-VHS
 - - LV - 6
 - -  |C - PS/2
 - LV - a semi circle
 -  |C - Din 5 Female
 LV - a single socket
 -LA - socket shape
 - |V - a flat rectangle
 - -|C - USB A Port
 - |V - a tall rectangle
 - -LA - the port's width is
 - - LV - thin
 - - -|C - RJ11
 - - LV - wide
 - -  |C - RJ45
 - LV - a small square
 - -|C - mini firewire
 - LV - an octagon
 -  |C - Firewire
 LV - 1 pin only
  LA - plug fit
   LV - internal
   -|C - 3mm Stereo
   LV - metal jacket
    |C - Composite Video